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Efficient material used for mine heavy metal control and vegetation recovery and preparation method thereof

A technology of vegetation restoration and heavy metals, applied in chemical instruments and methods, soil conditioning materials, applications, etc., can solve problems such as the inability of plants to grow and survive, pollution, and difficulty in ecological restoration, and achieve the goal of improving the survival rate of plants, accelerating ore weathering, Reduce the effect of migration conversions

Inactive Publication Date: 2018-12-21
北京伦至环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of nutrients in the waste mine pile, there is no substrate for plant growth, and the plants cannot grow or have a low survival rate, which makes ecological restoration difficult.
In addition, the destruction of the preparation of the mining area makes the rainfall easy to infiltrate, and the leaching of heavy metals pollutes the groundwater environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of high-efficiency materials for heavy metal control and vegetation restoration in mines includes the following steps:

[0023] (1) Attapulgite, sodium sulfate, iron-containing minerals, humus, water retaining agent, cement, zeolite, ammonium bicarbonate according to the mass ratio 1:0.2-0.8:0.3-0.5:1.2-2:0.3-0.7:0.8 -1.4:0.3-0.6:0.1-0.35 After mixing evenly, after spraying water, granulate through a granulator and dry, the particle size range is 0.1mm-2mm;

[0024] (2) Place the above-mentioned granulation material in hot water at 70° C. for 30 minutes, then remove and dry to obtain porous microsphere particles;

[0025] (3) After soaking the above-mentioned porous microsphere particles into Pseudomonas and sulfate-reducing bacteria to be configured as a bacterial agent solution with a concentration of 10%-30% for 12 hours, dry at low temperature to obtain the bacterium for heavy metal control and vegetation recovery in mines efficient material. The poros...

Embodiment 2

[0029] Preparation of high-efficiency materials for heavy metal control and vegetation restoration in mines, except attapulgite: sodium sulfate: iron-containing minerals: humus: water-retaining agent: cement: zeolite: ammonium bicarbonate with a mass ratio of 1:0.4:0.4:1.6: In addition to the experimental group of 0.5:1.1:0.3:0.28, two groups of different mass ratios of attapulgite: sodium sulfate: iron-containing minerals: humus: water-retaining agent: cement: zeolite: ammonium bicarbonate were set up as controls, respectively Group 1 (1:1.2:0.4:2.4:0.5:1.8:0.9:0.5) and control group 2 (1.4:1.0:0.2:1.0:0.15:0.6:0.1:0.25), other steps are the same as in Example 1.

Embodiment 3

[0031] Using the potted plant mode, lay the high-efficiency materials for mine heavy metal control and vegetation restoration prepared in Example 2 directly on the collected mine waste rocks, the laying thickness is 3cm-20cm, and plant alfalfa. As for the room temperature at 20°C, and regularly simulate rainfall After watering, the survival rate of the experimental group reached 85% after planting for 3 days, and the leaching concentration of heavy metals was reduced by 67%; the survival rate of control group 1 was 60% after 3 days, and the survival rate of control group 2 was 45%. The leaching concentration was reduced by 30%. At the same time, the same type of agents purchased in the market were carried out in the same experiment, and it was found that the survival rate of the plants was about 70%, and the leaching concentration of heavy metals was reduced by 18%.

[0032]The present invention proposes to use the compound effect of high-efficiency adsorbent, microbial carrie...

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Abstract

The invention discloses an efficient material used for heavy metal control and vegetation recovery and a preparation method thereof. In the material provided by the invention, attapulgite is taken asa heavy material adsorption material and a microbial growth carrier, sodium sulphate is taken as a microbial electron acceptor, humus is taken as a carbon source and an electron acceptor, a water-retaining agent provides water retention and water holding for the material, cement and zeolite are taken as a stabilizing binder and a microbial carrier, so that various free-state heavy metal ions can be adsorbed, and therefore, migration of heavy metal is prevented from being strengthened as a result of leaching, on waste ores, of rainfalls; on the basis of sufficient humus, sulphate is converted into negative bivalent sulphur ions by promoting microbial effect, the sulphur ions can generate precipitates with heavy metal ions, so that migration and transformation of heavy metal ions are reduced. The repair material provided by the invention is low in cost, and pseudomonas can quicken ore weathering; and the repair material is combined with mature matrix for use, so that a matrix environmentand nutrient salt can be provided for plants needed by ecological restoration, and therefore, a plant survival rate is increased.

Description

technical field [0001] The invention belongs to the technical field of mine environment restoration, and in particular relates to a high-efficiency material for mine heavy metal control and vegetation restoration and a preparation method thereof. Background technique [0002] At present, my country's mine mining has resulted in the destruction of a large amount of land, leading to a series of environmental problems, such as soil erosion, heavy metal pollution, etc., especially during the mining of mineral resources and ore smelting, a large amount of tailing sand, waste rock and other solids are often discharged into the environment Waste, among which tailings sand is very harmful to the ecological environment. Tailings sand refers to the solid waste that is discharged after ore crushing, directional chemical extraction, flotation, and magnetic separation to extract useful components. The main components are powder and sand, with high heavy metal content, poor nutrient conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40
CPCC09K17/40
Inventor 马志飞李耀辉向猛罗章杜鹏尹交英
Owner 北京伦至环境科技有限公司
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